Originally Posted by
zacster
But even with 200 lumens/watt, Cree is speculating on real-life lights that will put out over 100, nowhere close to 200. I just bought an LED bulb for my house and it gets 50 lumens per watt.
Cree isn't speculating. They are selling (or will be soon) LEDs that can produce up to 200 lumens/watt.
Here's a link to the data sheet.
Now, the "up to 200 lumens/watt" part does require that you put the right amount of current to reach it's maximum efficiency -- but this is true of any LED. It's just that no LED has had a maximum efficiency of 200 lumens/watt before.
I just bought an LED bulb for my house and it gets 50 lumens per watt.
So you didn't buy a MK-R bulb. Just because CREE released (or is about to) a new, more efficient emitter, that doesn't mean that existing LEDs will somehow disappear or get magically upgraded.
Side note: the picture at the link I gave shows a unit with four modules (I'm not sure these are the right terms, but it's pretty obvious from the picture that there's four of them.)